Bellow the details:
- recolorization of links (link, active, visited and hover) to the colors of the Google logo,
- add an indent for the text below the URL of the result,
- relax the width of the results to optimize the use of the available vertical space (less scrolling),
- add a round border to each result with a blue background,
- add an hover effect that makes this background and its border respectively switch to yellow and red (Google logo colors again).

Changelog (19/05/2010):
- fix the total result width to 100% after the big Google look-and-feel refresh (margin-right set to 0px)